Initial sparker for gas-engine magnetos.



L. HAGGBLOM.

INITIAL SPARKER FOR GAS ENGINE MAGNETOS.

APPLICATION FILED DEC.26, .1913.

Patented. Apr. 27, 1915.

II i W.

LEONARD HAGGlBLOM, OF LOS ANGELES, CALIFORNIA.

INITIAL srARKnRFoR GAS-ENGINE MAGNETOS.

specification of Letters Patent.

Patented 27,1915.

Application filed December 26, 1913. Serial No. 808,699.

T ull 301mm it may) concern Be it known that I, LEONARD HAGGBLOM, a citizen ofthe United States, residing at Los Angeles, California, have invented a new and useful Initial 'Sparker for Gas-Engine Magnetos, of which the following is a specification.

My objectis to apply an' attachment tothe magneto of a gas engine so thatwhenthe engine is'crankedithe magneto willproduce the initial spark to start the engine without the use of a battery; or to construct a magneto in accordance with the principles of my invention; and myinvention consists of the novel features herein shown, described and claimed.

Figure 1 is a front elevation of a gas engine equipped with a magneto embodying the principles of my'invention. Fig. 2 is a top plan view as indicated by the arrow 2 in Figsland 3. Fig. 3 'is a; side elevation as indicated by the arrow '3 in Fig.2. Fig- 4 ,is a vertical section on a'plane parallel with v Fig. 3 as indicated by the lines in Figs.

1, 2 and 5. Fig. 5 is an enlarged vertical cross section on the lines 5-5 of Figs. 2, 3 and 4:. Fig. 6 is a rerticaleross section on the lines of. Figs. 3 and at. Fig. 7 is the side elevationofthe spring casing and cam. Fig. 81 is a fragmentary perspective upon an enlarged scale of the locking device.

The magneto shaft 1 of the magneto 2 has a gear 3 upon its extreme forward end con necting with an idler 4 and thisidler meshes with a driving gear 5 fixed upon the engine shaft 6. The magneto shaft 1 rotates in the same direction as the engine shaft 6 s The hub? j is fixed upon the magneto shaft 1," and carries the mutilated disk 8, the periphery ofQthe disk extending normally beondthe periphery of the hub. The disk is preferably :formed integral with the hub.

The portion 9 of the periphery of the disk 8 occupies substantially onethird of the circumferenceand is concentric with the shaft 1. The portion 10 of theperiphery of the disk 8 occupiessubstantially one third of the circumference of the disk and is eccentric to the shaft 1 there being a radial shoulder at the junction'of. the portion 9 to the portion 10 forming a locking tooth 11. The portion 12 of the periphery of the disk 8 is concentric toxthe shaft '1 upon a smaller circle, thus leaving'a notch in which the stop tooth 13 operates. A. sleeve 14. extends from the side 15 relative to the shaft 1.

in engagement with the tooth 11.

face of the disk 8 around, the shaft 1. A hub-1'5 is loosely mounted upon this sleeve 14 and the gear 3 is fixed to the forward end of thishub. The inner end of the hub 15 is bored out to form the spring casing 16 and the clock spring 16 is connected at its inner. end to the sleeve 1 1 and at its outer. end to the spring casing 16. The stop tooth.

13 extends from the rear face of the spring casing 16 into the notch in'the periphery of" the disk 8 to limit the rotation of the hub An eccentric 17 is formed upon the periphery of the spring casing 16.

The dash pot casing 18-is rigidly mounted upon the frame of the magneto andha's a vertical piston chamber 19 normally open at the bottom. The piston 20 is mounted on the piston chamber and the locking dog 21 extends downwardly from the piston and serves as a stem for the piston. A capf'"22 is placed against the lower face of the-casing 18 and has a rectangular bearing through which the locking dog 21 reciprocates said locking dog being also rectangular so as to prevent rotation. I

One half of the lower end ofthe lockingdog 21 is a tooth 23 and in the plane of the;

disk 8 and is adapted to catch the toothhll, and the other half 2% is a cam and is'gin the plane of the eccentric 17 so that when the 4 disk 8, thus leaving a concentric rim 12 upon which the tooth 23 rides over the 1 notch.

Normally the spring 16* is unwound to the limit of the notch in the periphery of the disk 8 and the tooth 13 stands in the position shown in Fig. 6 and the tooth 23 is When the engine is cranked the fii'st movement of the engineshaft will rotate the gear 3, wind-. ing up the sp moves to the ot er end of the notch-as indi cated by the dotted lines in Fig. 6, and this operation will bring the high part of the ing 16 until the tooth 13" eccentric 17 in position to raise the cam. 24:,

thereby raising the tooth 23 out of engagement with the tooth 11 and raising the piston 20 in the piston chamber 19 thus allowing the tension of the spring 16- to give a 1 locking dog up,

quick rotation to the shaft 1, thereby gen erating a spark to ignite and start the onand a cam 26 extends from this ring in-a po sition to pass under the pin 27 extending from the locking dog 21' so that when the cam 26 passes under the pin QY-Jthe locking dog will be held up to avoid unnecessary Wear. A spring 98 holds the cam 26 normally out of use and a rod 2-9 provides means for operating the cam 26 and holding the locking dog out of use. This rod may be held in any suitable way and released when it is desired to start the engine.

The piston 20 controlling the locking dog 21 works like-a dash pot withan air cham her. When the engine is started and the locking dog 21 thrown upwardly, it will come down only gradually, being held by the air pressure, and the continued rapid. rotation of the magneto shaft will keep the but whenthe magneto shaft comes to a standstill the'locking" dog will a slowly settle down into position to engage the tooth 11. In this manner the engine may be equipped with a magneto and started without the use of a battery.

It is obvious that a governor or a mag- ;netic mechanism may be tubstituted for the I dash pot Without departing from the spirit of my invention, and that other details may be varied in many ways.

1. The combination with a magneto shaft arranged with its axis extending along; a

difierent line from the axis of the engine shaft, of means operatively cdhnecting said magneto shaft to said. engine shaft to trans mit a rotary movement from said engine shaft to said magneto shaft, a daslnpot, a member operating in said dash-pot and provided with a dog, means coiiperating with said dog to hold said magneto shaft as the engine starts, means to release said magneto shaft, and means to rotate said magneto shaft with an increased speed upon its re lease.

2. The combination, with a magneto shaft having its axis extending along a different line from the axis of the engine shaft, of means operatively connecting said magneto shaft to the engine shaft to rotate said ma neto shaft, a dash-pot, a member operating within and projecting from said dash-pot, means cooperating with said member While said. member is extended to hold said magneto shaft the engine starts, means to re tract said member, and means to lock sald .member in the retracted position after the tion of the engine, said dog being provided with part projecting laterally therefrom to cooperate with the last named means.

at. The combination, with a magneto shaft operatively connected with an engine shaft, of a dash-pot having a piston head and a stem the outer end of which has formed thereon a dog for holding the magneto shaft as the engine shaft starts, means to retract said stem to release the magneto shaft means to cause the magneto shaft to snap ahead to the extent of the-lost motion to produce the initial spark to start the engine, said means to retract said stem comprising a cam operating thereon against the opposition of the air in the dash-pot,

The combination, with a magneto shaft operatively connected with an engine shaft, of a mutilated disk mounted on said magneto shaft in fixed relation thereto, said disk having a peripheral portion eccentric to the magneto shaft and terminating in a locking tooth, a dog to cooperate with said locking tooth, a casing extending around said magneto shaft, said casing having a partial rotation with respect to said magneto shaft and being provided with a stop tooth which operates against a shoulder on said mutilated. disk to-hold the magneto shaft as the engine starts, a spring to cause said casing to rotate yieldingly with relation to said engine shaft, and means operatively connecting the engine shaft to said casing to rotate the latter, said casing having upon its periphery means to release said dog to cause the magneto shaft to snap ahead.

' LEONARD HAGGBLOM. YVitnesses Ban'rrm liloMAsTER, Serum: G. Farms. 

